encodingfilter.java

一个学生选课系统

package com.student.filter;

import java.io.IOException;

import javax.servlet.*;;

public class EncodingFilter implements Filter {
	String encoding=null;
	FilterConfig filterConfig=null;

	public void destroy() {
		// TODO Auto-generated method stub
		this.encoding=null;
		this.filterConfig=null;
	}
   
	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {
		// TODO Auto-generated method stub
		if(encoding!=null)
		{//对请求进行编码设置
			request.setCharacterEncoding(encoding);
		}
		
		chain.doFilter(request, response);
		//System.out.println("houhou"+encoding);
	}
	
	/**
	  * 初始化Filter的时候，该方法被调用
	  */

	public void init(FilterConfig config) throws ServletException {
		// TODO Auto-generated method stub
		this.filterConfig=config;
		this.encoding = filterConfig.getInitParameter("encoding");
	}

}